Sandwich PhD Programs: How Split-Site Doctorates Work for ASEAN Researchers
By Muntasir Minhaz • Published Aug 07, 2026 • Graduate & Professional School, Study in Southeast Asia
A sandwich PhD lets you stay enrolled at your home ASEAN university while spending a set block of time doing research at a partner university abroad, under two supervisors. You keep your home tuition rate and only need separate funding for the time you spend overseas.
🎓 You get one degree, from your home university, not two
Your host stay usually runs a few months up to a year, in one block or split across your PhD
You need a home supervisor and a host supervisor who agree on a joint research plan before you go
💵 Funding is split: your home stipend covers the local part, a separate grant covers the time abroad
This differs from a cotutelle, where two universities co-award one joint degree
What a sandwich PhD is
A sandwich PhD keeps you enrolled at one university, your home university in ASEAN, for the whole degree. You travel to a partner university abroad for a defined research period, then return to finish and defend at home. The name comes from the structure: home time, abroad time, home time again.
Only one institution awards your final degree. That is the main difference from a cotutelle or joint doctorate, where two universities co-sign a single certificate and you must satisfy both sets of graduation rules.
How it differs from other split-site routes
| Model | Who awards the degree | Where you are based |
|---|---|---|
| Sandwich PhD | Home university only | Home university, with a research stay abroad |
| Cotutelle / joint doctorate | Both universities jointly | Split, often close to 50/50 |
| Full PhD abroad | Host university only | Host university for the whole degree |
Programs branded as Erasmus Mundus Joint Doctorates or Erasmus+ joint doctorates through the Erasmus+ program follow the joint-degree model rather than the sandwich model. Some scholarship providers use split-site and sandwich as loose synonyms, so read the fine print on who actually signs your final degree certificate before you apply.
How supervision works
You need two supervisors: one at your home university, one at the host institution. Before you travel, both supervisors and you draft a research plan that states what work happens at each site, what equipment or data you need from the host lab, and how often you check in with each supervisor while abroad.
Universities usually formalize this in a memorandum of agreement or co-supervision agreement between the two institutions. Get this signed before you commit to travel dates. It protects you if a supervisor changes institutions or a lab access problem comes up midway through your stay.
How funding is arranged
Funding for a sandwich PhD comes from two separate pots, and you should expect to apply for each one on its own timeline. Your home stipend, whether from your university, a national scholarship body, or your own funding, continues to cover base costs and tuition while you stay enrolled at home.
A second grant covers the abroad segment: travel, a higher cost-of-living allowance, and sometimes a bench fee to the host lab. Programs historically run by DAAD for Southeast Asian researchers have paired a home-country scholarship with a separate sandwich-stay grant for time in Germany, and the British Council has backed similar split-site scholarship schemes pairing UK universities with partner institutions in Asia. Eligible countries, fields, and award terms change from one call to the next, so confirm current details on the funder's own program page before you plan a budget around it.
Finding a placement
Start with your home supervisor. Existing research collaborations between your department and a foreign lab are the fastest route to a placement, since the groundwork on data sharing and equipment access already exists.
Search funder databases directly. DAAD, the British Council, and national research councils in ASEAN countries list current sandwich or split-site calls along with eligible fields and partner countries.
Contact potential host supervisors directly with a short research proposal, your CV, and a note on what funding you plan to apply for. Professors who already host international sandwich students tend to respond faster.
Check your home university's graduate school rules on minimum in-residence time. Most PhD programs cap how much of your candidacy you can spend away, so confirm this before planning a long stay abroad.
What to settle before you travel
Authorship order and data ownership for work produced at the host lab
Which supervisor signs off on thesis chapters written abroad
Visa type for the host country and whether it allows the research activity you plan to do
Insurance coverage, since your home policy may not cover you once you leave your home country
A written return-and-reporting plan, so your home department knows what to expect when you come back
When in your PhD to plan a sandwich stay
Most sandwich placements work best in the middle years of a PhD, after you have a clear research question and enough background to use a host lab's equipment or data productively, but before you are deep into writing your final chapters. Going too early means you may not yet know exactly what the host lab should help you with, and going too late leaves little time to bring findings back into your thesis.
Talk to your home graduate school about how a stay abroad interacts with your progress milestones, such as your candidacy confirmation or annual review. Some programs pause the review clock while you are abroad, others expect you to submit reports remotely, so confirm this before you travel rather than after.
Questions to ask before you commit
What happens to my home stipend if the abroad grant pays a separate living allowance, does one reduce the other?
Who owns any equipment, code, or dataset I help build at the host lab after I leave?
Does the host institution expect me to pay any bench fees or lab access charges not covered by my grant?
What is the process if my host supervisor leaves or becomes unavailable partway through my stay?
Will my home university recognize coursework or training completed abroad toward my final degree requirements?
Get answers in writing where you can, ideally inside the memorandum of agreement between the two universities. A sandwich PhD adds real value through the access and mentorship a host lab gives you, but only if the administrative side is settled early enough that you spend your time abroad on research, not paperwork.